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Showing content from https://github.com/stlink-org/stlink/pull/1098 below:

unknown chip id (--connect-under-reset not working) · Issue #1098 · stlink-org/stlink · GitHub

• Programmer/board type: stlink v3 mini
• Operating system and version: Windows
• Stlink tools version : 1.6.1
• Stlink commandline tool name: st-flash
• Target chip (and board if applicable): STM32G031

Commandline-Output:

st-flash --connect-under-reset --debug erase
st-flash 1.6.1
2021-03-10T13:43:30 DEBUG common.c: *** looking up stlink version
2021-03-10T13:43:30 DEBUG common.c: st vid         = 0x0483 (expect 0x0483)
2021-03-10T13:43:30 DEBUG common.c: stlink pid     = 0x374e
2021-03-10T13:43:30 DEBUG common.c: stlink version = 0x3
2021-03-10T13:43:30 DEBUG common.c: jtag version   = 0x7
2021-03-10T13:43:30 DEBUG common.c: swim version   = 0x0
2021-03-10T13:43:30 DEBUG common.c:     notice: the firmware doesn't support a swim interface
2021-03-10T13:43:30 DEBUG common.c: *** looking up stlink version
2021-03-10T13:43:30 DEBUG common.c: st vid         = 0x0483 (expect 0x0483)
2021-03-10T13:43:30 DEBUG common.c: stlink pid     = 0x374e
2021-03-10T13:43:30 DEBUG common.c: stlink version = 0x3
2021-03-10T13:43:30 DEBUG common.c: jtag version   = 0x7
2021-03-10T13:43:30 DEBUG common.c: swim version   = 0x0
2021-03-10T13:43:30 DEBUG common.c:     notice: the firmware doesn't support a swim interface
2021-03-10T13:43:30 DEBUG common.c: stlink current mode: mass
2021-03-10T13:43:30 DEBUG usb.c: JTAG/SWD freq set to 0
2021-03-10T13:43:30 DEBUG common.c: *** set_swdclk ***
2021-03-10T13:43:30 INFO usb.c: Unable to match requested speed 1800 kHz, using 1000 kHz
2021-03-10T13:43:30 DEBUG common.c: stlink current mode: mass
2021-03-10T13:43:30 DEBUG common.c: *** stlink_enter_swd_mode ***
2021-03-10T13:43:30 DEBUG common.c: *** stlink_jtag_reset ***
2021-03-10T13:43:30 DEBUG common.c: *** stlink_reset ***
2021-03-10T13:43:30 DEBUG common.c: *** stlink_write_debug32 5fa0004 to 0xe000ed0c
2021-03-10T13:43:30 DEBUG common.c: Loading device parameters....
2021-03-10T13:43:30 DEBUG common.c: *** stlink_core_id ***
2021-03-10T13:43:30 DEBUG common.c: core_id = 0x000003e8
2021-03-10T13:43:30 DEBUG common.c: *** stlink_read_debug32 3e8 is 0xe0042000
2021-03-10T13:43:30 WARN common.c: unknown chip id! 0x3e8
Failed to connect to target

Expected/description:
my board uses swd and swclk gpios, so in order to connect with mcu stlink must connect under reset conditions, while it works perfectly fine using STM32CubeProgrammer (connect under reset option is selected), st-flash fails to read chip id
It looks like --connect-under-reset param doesn't have any effect. At the same time, I can use the same st-flash config to program all my other boards.

STM32CubeProgrammer log:

13:57:38 : ST-LINK SN : 001A003E3137511433333639
13:57:38 : ST-LINK FW : V3J7M2
13:57:38 : Voltage : 3.33V
13:57:38 : SWD freq : 24000 KHz
13:57:38 : Connect mode: Under Reset
13:57:38 : Reset mode : Software reset
13:57:38 : Device ID : 0x466
13:57:38 : UPLOADING OPTION BYTES DATA ...
13:57:38 : Bank : 0x00
13:57:38 : Address : 0x40022020
13:57:38 : Size : 32 Bytes
13:57:38 : Bank : 0x01
13:57:38 : Address : 0x40022080
13:57:38 : Size : 16 Bytes
13:57:38 : UPLOADING ...
13:57:38 : Size : 1024 Bytes
13:57:38 : Address : 0x8000000
13:57:38 : Read progress:
13:57:38 : Data read successfully
13:57:38 : Time elapsed during the read operation is: 00:00:00.001

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